diff options
Diffstat (limited to 'configs')
| -rw-r--r-- | configs/common/MemConfig.py | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/configs/common/MemConfig.py b/configs/common/MemConfig.py index 4692c2d0e..3d1ae4e64 100644 --- a/configs/common/MemConfig.py +++ b/configs/common/MemConfig.py @@ -127,7 +127,7 @@ for alias, target in _mem_aliases_all: # Normal alias _mem_aliases[alias] = target -def create_mem_ctrl(cls, r, i, nbr_mem_ctrls, intlv_bits, cache_line_size): +def create_mem_ctrl(cls, r, i, nbr_mem_ctrls, intlv_bits, intlv_size): """ Helper function for creating a single memoy controller from the given options. This function is invoked multiple times in config_mem function @@ -135,9 +135,7 @@ def create_mem_ctrl(cls, r, i, nbr_mem_ctrls, intlv_bits, cache_line_size): """ import math - # The default behaviour is to interleave on cache line granularity - cache_line_bit = int(math.log(cache_line_size, 2)) - 1 - intlv_low_bit = cache_line_bit + intlv_low_bit = int(math.log(intlv_size, 2)) # Create an instance so we can figure out the address # mapping and row-buffer size @@ -160,13 +158,13 @@ def create_mem_ctrl(cls, r, i, nbr_mem_ctrls, intlv_bits, cache_line_size): rowbuffer_size = ctrl.device_rowbuffer_size.value * \ ctrl.devices_per_rank.value - intlv_low_bit = int(math.log(rowbuffer_size, 2)) - 1 + intlv_low_bit = int(math.log(rowbuffer_size, 2)) # We got all we need to configure the appropriate address # range ctrl.range = m5.objects.AddrRange(r.start, size = r.size(), intlvHighBit = \ - intlv_low_bit + intlv_bits, + intlv_low_bit + intlv_bits - 1, intlvBits = intlv_bits, intlvMatch = i) return ctrl @@ -192,13 +190,19 @@ def config_mem(options, system): cls = get(options.mem_type) mem_ctrls = [] + # The default behaviour is to interleave memory channels on 128 + # byte granularity, or cache line granularity if larger than 128 + # byte. This value is based on the locality seen across a large + # range of workloads. + intlv_size = max(128, system.cache_line_size.value) + # For every range (most systems will only have one), create an # array of controllers and set their parameters to match their # address mapping in the case of a DRAM for r in system.mem_ranges: for i in xrange(nbr_mem_ctrls): mem_ctrl = create_mem_ctrl(cls, r, i, nbr_mem_ctrls, intlv_bits, - system.cache_line_size.value) + intlv_size) # Set the number of ranks based on the command-line # options if it was explicitly set if issubclass(cls, m5.objects.DRAMCtrl) and \ |